luisifer

Here’s a case which is quite similar to yours. Maybe you can take it as reference.

https://www.ads-software.com/support/topic/administrator-unable-to-edit-users?replies=3

Try this plugin. It might suit your requirement.

https://www.ads-software.com/extend/plugins/slideshow-gallery/

Why don’t you just publish the link of your category page, something like yourdomain.com/categoryA in your site?

Is the database located at the same server with your WordPress installation? If it is, just put localhost as the value in the config file should be able solve the issue.

If you totally new to WordPress, you may try WordPress.com to get familiar with the Dashboard interface and some basic functions first. However WordPress.com doesn’t allow you to install theme and plugins. After you know how to play with all the basic functions, you can move on to self hosted WordPress.